Lighting device



FIG. 1 is a top, front and left side perspective view of a lighting device showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof, the right side elevational view being a mirror image;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines showing the environment in the figures are for illustrative purpose only and form no part of the claimed design. 

The ornamental design for a lighting device, as shown and described. 